A letter sent from a U.S. soldier stationed in Germany to his mother in Massachusetts has been delivered 76 years after it was sent. Army Sgt. John Gonsalves, 22 at the time, wrote to his mother in Woburn in December 1945 after the official end of WWII, WFXT-TV reported Wednesday. The letter would sit unopened for more than 75 years before being found in a U…